/* ==========================================================================
   凤凰体育入口 · FH — 共享样式 /assets/site.css
   蓝图网格 · 夜场朱红鎏金 · 等宽索引
   ========================================================================== */

/* 1. 设计令牌 ------------------------------------------------------------- */
:root {
  --ink: #0B1220;
  --ink-2: #111C33;
  --ink-3: #070C15;
  --red: #E23A2E;
  --orange: #FF5A36;
  --gold: #F5B53D;
  --mint: #2FD6A5;
  --paper: #F4F7FB;
  --mist: #A9B4C6;
  --line: #2A3A55;
  --deep-red: #8E1F18;
  --ink-text: #D6DEEB;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --w: 1220px;
  --gut: clamp(16px, 4vw, 40px);
  --hair: 1px solid var(--line);
  --radius: 4px;
}

/* 2. 重置 ---------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--paper);
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(42, 58, 85, 0.34) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 58, 85, 0.34) 1px, transparent 1px),
    radial-gradient(115% 70% at 82% -8%, rgba(226, 58, 46, 0.24), transparent 62%),
    radial-gradient(85% 55% at 4% 0%, rgba(245, 181, 61, 0.12), transparent 58%);
  background-size: 72px 72px, 72px 72px, 100% 100%, 100% 100%;
  background-attachment: fixed;
  background-repeat: repeat, repeat, no-repeat, no-repeat;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, video { max-width: 100%; height: auto; }

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0; padding: 0; }

a { color: var(--gold); text-decoration: none; }
a:hover { color: var(--orange); }

button { font: inherit; }

::selection { background: var(--red); color: #fff; }

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 2px;
}

#main-content { display: block; }
#main-content:focus { outline: none; }

/* 3. 跳转链接 ------------------------------------------------------------ */
.skip-link {
  position: absolute;
  left: 12px;
  top: -90px;
  z-index: 200;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--gold);
  border-radius: 0 0 4px 4px;
  transition: top 0.16s ease;
}
.skip-link:focus {
  top: 0;
  color: var(--ink);
  text-decoration: none;
}

/* 4. 布局基础 ------------------------------------------------------------ */
.wrap {
  width: 100%;
  max-width: var(--w);
  margin-inline: auto;
  padding-inline: var(--gut);
}

.section { padding-block: clamp(36px, 5vw, 76px); position: relative; }
.section--tight { padding-block: clamp(20px, 3vw, 40px); }

.blueprint {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 24px);
}
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.divider {
  height: 1px;
  border: 0;
  margin: clamp(20px, 3vw, 36px) 0;
  background: linear-gradient(90deg, var(--line), rgba(42, 58, 85, 0));
}

/* 5. 章节标识 ------------------------------------------------------------ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 10px;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--red);
}

.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2vw, 28px);
  align-items: start;
  padding-top: 18px;
  margin-bottom: clamp(18px, 2.5vw, 32px);
  border-top: var(--hair);
}

.section-no {
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(245, 181, 61, 0.5);
}
@supports not ((-webkit-text-stroke: 1px #fff)) {
  .section-no { color: rgba(245, 181, 61, 0.36); }
}

.section-title {
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
}

.section-lede {
  max-width: 62ch;
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* 6. 按钮 ---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--paper);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 3px;
  cursor: pointer;
  transition: transform 0.16s ease, background-color 0.16s ease,
    border-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  color: #180709;
  background-image: linear-gradient(135deg, var(--orange), var(--red) 58%, var(--deep-red));
  border-color: rgba(245, 181, 61, 0.5);
  box-shadow: 0 10px 24px -16px rgba(255, 90, 54, 0.95);
}
.btn-primary:hover,
.btn-primary:focus-visible {
  color: #12060a;
  transform: translateY(-1px);
  box-shadow: 0 14px 28px -14px rgba(255, 90, 54, 1);
}

.btn-ghost {
  color: var(--paper);
  background: transparent;
  border-color: var(--line);
}
.btn-ghost:hover,
.btn-ghost:focus-visible {
  color: var(--gold);
  border-color: rgba(245, 181, 61, 0.7);
}
.btn-quick {
  padding: 0 16px;
  font-size: 13px;
  letter-spacing: 0.1em;
}

/* 7. 页头 ---------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(11, 18, 32, 0.97), rgba(11, 18, 32, 0.9));
  border-bottom: var(--hair);
  box-shadow: 0 16px 34px -28px rgba(0, 0, 0, 0.95);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--red) 0 20%,
    var(--gold) 20% 27%,
    rgba(42, 58, 85, 0.85) 27% 100%
  );
}

.header-rail {
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: var(--w);
  margin-inline: auto;
  padding: 9px var(--gut) 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}
.rail-coord { color: var(--gold); }
.rail-meta {
  margin-left: auto;
  text-align: right;
  letter-spacing: 0.1em;
  text-transform: none;
}

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: var(--w);
  margin-inline: auto;
  padding: 10px var(--gut) 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
  text-decoration: none;
}
.brand:hover { color: var(--paper); text-decoration: none; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #fff;
  background-image: linear-gradient(145deg, var(--red), var(--orange));
  box-shadow: inset 0 0 0 1px rgba(245, 181, 61, 0.5);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 17px; font-weight: 800; letter-spacing: 0.04em; }
.brand-sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
  margin-top: 3px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}
.nav-item { list-style: none; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 11px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--paper);
  text-decoration: none;
  border-radius: 3px;
  transition: color 0.16s ease, background-color 0.16s ease;
}
.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--mist);
  transition: color 0.16s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 4px;
  height: 2px;
  background-image: linear-gradient(90deg, var(--red), var(--gold));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.18s ease;
}
.nav-link:hover,
.nav-link:focus-visible {
  color: var(--gold);
  text-decoration: none;
  background-color: rgba(245, 181, 61, 0.06);
}
.nav-link:hover .nav-index { color: var(--gold); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: var(--gold);
  background-color: rgba(245, 181, 61, 0.09);
}
.nav-link[aria-current="page"] .nav-index { color: var(--red); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 15px;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: rgba(17, 28, 51, 0.92);
  border: var(--hair);
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 0.16s ease, color 0.16s ease;
}
.nav-toggle:hover { border-color: rgba(245, 181, 61, 0.6); color: var(--gold); }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold);
  transition: transform 0.18s ease;
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.site-header[data-open] .nav-toggle-bars::before { transform: translateY(4px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bars::after { transform: translateY(-4px) rotate(-45deg); }

.scroll-meter {
  position: relative;
  height: 2px;
  overflow: hidden;
  background: rgba(42, 58, 85, 0.55);
}
.scroll-meter-fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--red), var(--orange) 55%, var(--gold));
  transition: transform 0.12s linear;
}

/* 8. 页脚 ---------------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  padding: clamp(28px, 4vw, 50px) 0 24px;
  color: var(--paper);
  background-image: linear-gradient(180deg, rgba(17, 28, 51, 0.6), var(--ink-3) 58%);
  border-top: var(--hair);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(340px, 44%);
  height: 2px;
  background-image: linear-gradient(90deg, var(--red), var(--gold));
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.35fr);
  gap: clamp(24px, 4vw, 56px);
}

.footer-brand-line {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.05em;
}
.footer-brand-sub {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}
.footer-note {
  max-width: 38ch;
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}
.footer-cta { margin-top: 18px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 32px);
}
.footer-col-title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  border-bottom: var(--hair);
}
.footer-links {
  display: grid;
  gap: 9px;
  list-style: none;
}
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: #C9D3E3;
  text-decoration: none;
  transition: color 0.15s ease;
}
.footer-link::before {
  content: "";
  width: 10px;
  height: 1px;
  background: var(--line);
  transition: width 0.15s ease, background-color 0.15s ease;
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--gold);
  text-decoration: none;
}
.footer-link:hover::before,
.footer-link:focus-visible::before {
  width: 16px;
  background: var(--gold);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 3.5vw, 40px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: var(--hair);
}
.contact-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: rgba(11, 18, 32, 0.72);
  border: 1px solid rgba(42, 58, 85, 0.66);
  border-left: 2px solid rgba(226, 58, 46, 0.72);
}
.contact-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}
.contact-value {
  font-size: 14px;
  line-height: 1.65;
  color: var(--paper);
  overflow-wrap: anywhere;
}
.contact-value--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  color: var(--gold);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  margin-top: clamp(20px, 3vw, 30px);
  padding-top: 18px;
  border-top: var(--hair);
  font-size: 12.5px;
  color: var(--mist);
}
.footer-legal-line {
  margin: 0;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  color: var(--mist);
}
.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  list-style: none;
}
.legal-link {
  color: #C9D3E3;
  text-decoration: none;
  transition: color 0.15s ease;
}
.legal-link:hover,
.legal-link:focus-visible { color: var(--gold); text-decoration: none; }

.footer-meta {
  margin: 0 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* 9. 通用内容组件 -------------------------------------------------------- */
.card {
  position: relative;
  padding: clamp(16px, 2vw, 22px);
  background-image: linear-gradient(180deg, rgba(17, 28, 51, 0.86), rgba(11, 18, 32, 0.88));
  border: var(--hair);
  border-radius: var(--radius);
  transition: border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}
.card:hover {
  border-color: rgba(226, 58, 46, 0.66);
  box-shadow: 0 20px 44px -34px rgba(255, 90, 54, 0.85);
  transform: translateY(-2px);
}
.card-title { margin: 0 0 8px; font-size: 17px; font-weight: 700; }
.card-meta {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 24px;
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
  background: rgba(17, 28, 51, 0.75);
  border: var(--hair);
  border-radius: 999px;
}
.badge--gold { color: #1A1206; background: var(--gold); border-color: var(--gold); }
.badge--red {
  color: #fff;
  background-image: linear-gradient(135deg, var(--red), var(--deep-red));
  border-color: rgba(245, 181, 61, 0.45);
}
.badge--mint { color: #04231B; background: var(--mint); border-color: var(--mint); }

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }

.breadcrumb {
  padding-block: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
}
.breadcrumb-list li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: var(--line);
}
.breadcrumb a { color: var(--mist); text-decoration: none; }
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb [aria-current="page"] { color: var(--gold); }

.media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--ink-2);
  background-image:
    linear-gradient(135deg, #0E1A2D, #111C33 55%, #0B1220),
    repeating-linear-gradient(90deg, rgba(42, 58, 85, 0.5) 0 1px, transparent 1px 56px);
  border: var(--hair);
  border-radius: var(--radius);
}
.media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.figure-caption {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}

.prose {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-text);
}
.prose h2,
.prose h3 { margin: 1.6em 0 0.6em; color: var(--paper); }
.prose h2 { font-size: clamp(20px, 2.4vw, 26px); }
.prose h3 { font-size: 18px; }
.prose ul,
.prose ol { padding-left: 1.15em; margin: 0 0 1em; }
.prose li { margin-bottom: 0.4em; }

.mono { font-family: var(--font-mono); letter-spacing: 0.06em; }
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.data-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  overflow: hidden;
  background: var(--line);
  border: var(--hair);
  border-radius: var(--radius);
}
.data-item { padding: 14px 16px; background: rgba(11, 18, 32, 0.93); }
.data-value {
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 700;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.data-label {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

/* 10. 筛选条 ------------------------------------------------------------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.filter-btn {
  min-height: 44px;
  padding: 0 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
  background: rgba(17, 28, 51, 0.72);
  border: var(--hair);
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.16s ease, border-color 0.16s ease,
    background-color 0.16s ease, box-shadow 0.16s ease;
}
.filter-btn:hover { color: var(--paper); border-color: rgba(245, 181, 61, 0.6); }
.filter-btn[aria-pressed="true"] {
  color: #04231B;
  background: var(--mint);
  border-color: var(--mint);
  box-shadow: 0 0 0 3px rgba(47, 214, 165, 0.16);
}
.filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.is-hidden { display: none !important; }

/* 11. 渐显 --------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }

/* 12. 响应式 ------------------------------------------------------------- */
@media (max-width: 1180px) {
  .nav-link { padding: 10px 8px; font-size: 13.5px; }
  .nav-index { display: none; }
  .nav-link::after { left: 8px; right: 8px; }
}

@media (max-width: 1024px) {
  .span-3,
  .span-4 { grid-column: span 6; }
  .span-8 { grid-column: span 12; }
}

@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    opacity: 0;
    background-image: linear-gradient(180deg, rgba(17, 28, 51, 0.99), rgba(11, 18, 32, 0.99));
    border-bottom: var(--hair);
    box-shadow: 0 26px 44px -32px rgba(0, 0, 0, 0.95);
    transition: max-height 0.22s ease, opacity 0.18s ease, visibility 0.18s ease;
  }
  .site-header[data-open] .nav {
    max-height: min(72vh, 540px);
    overflow-y: auto;
    visibility: visible;
    opacity: 1;
  }

  .nav-list { display: block; padding: 8px var(--gut) 16px; }
  .nav-item { border-bottom: 1px solid rgba(42, 58, 85, 0.6); }
  .nav-item:last-child { border-bottom: 0; }
  .nav-link {
    display: flex;
    width: 100%;
    align-items: center;
    gap: 12px;
    padding: 15px 2px;
    font-size: 16px;
    border-radius: 0;
  }
  .nav-link::after { display: none; }
  .nav-index { display: inline; font-size: 11px; color: var(--red); }

  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-meta { margin-left: 0; }
}

@media (max-width: 760px) {
  .header-rail {
    flex-wrap: wrap;
    gap: 6px;
    font-size: 10px;
    letter-spacing: 0.06em;
  }
  .rail-meta {
    flex-basis: 100%;
    margin-left: 0;
    text-align: left;
  }
  .filter-bar {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }
  .filter-btn { flex: 0 0 auto; }
  .filter-count { margin-left: 12px; white-space: nowrap; }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  .span-3,
  .span-4,
  .span-6,
  .span-8 { grid-column: span 12; }

  .section-head {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }
  .section-no { font-size: 30px; }
}

@media (max-width: 560px) {
  .brand-mark { width: 38px; height: 38px; font-size: 14px; }
  .brand-name { font-size: 15.5px; }
  .brand-sub { display: none; }
  .btn-quick { padding: 0 12px; font-size: 12px; letter-spacing: 0.04em; }
  .header-actions { gap: 8px; }
  .footer-legal { font-size: 12px; }
}

/* 13. 动效偏好 ----------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-meter-fill { transition: none; }
  .card:hover { transform: none; }
  .btn-primary:hover { transform: none; }
}